fsnotify: parent event notification

inotify and dnotify both use a similar parent notification mechanism.  We
add a generic parent notification mechanism to fsnotify for both of these
to use.  This new machanism also adds the dentry flag optimization which
exists for inotify to dnotify.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>

1 files changed, 25 insertions, 9 deletions

diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 3856eb6e5973..6a662ed0bc8a 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -23,15 +23,31 @@
 static inline void fsnotify_d_instantiate(struct dentry *entry,
                                                 struct inode *inode)
 {
+        __fsnotify_d_instantiate(entry, inode);
+
         inotify_d_instantiate(entry, inode);
 }
 
+/* Notify this dentry's parent about a child's events. */
+static inline void fsnotify_parent(struct dentry *dentry, __u32 mask)
+{
+        __fsnotify_parent(dentry, mask);
+
+        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
+}
+
 /*
  * fsnotify_d_move - entry has been moved
  * Called with dcache_lock and entry->d_lock held.
  */
 static inline void fsnotify_d_move(struct dentry *entry)
 {
+        /*
+         * On move we need to update entry->d_flags to indicate if the new parent
+         * cares about events from this entry.
+         */
+        __fsnotify_update_dcache_flags(entry);
+
         inotify_d_move(entry);
 }
 
@@ -117,7 +133,8 @@ static inline void fsnotify_nameremove(struct dentry *dentry, int isdir)
         if (isdir)
                 mask |= FS_IN_ISDIR;
         dnotify_parent(dentry, DN_DELETE);
-        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
+
+        fsnotify_parent(dentry, mask);
 }
 
 /*
@@ -188,9 +205,9 @@ static inline void fsnotify_access(struct dentry *dentry)
                 mask |= FS_IN_ISDIR;
 
         dnotify_parent(dentry, DN_ACCESS);
-        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 
+        fsnotify_parent(dentry, mask);
         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
 }
 
@@ -206,9 +223,9 @@ static inline void fsnotify_modify(struct dentry *dentry)
                 mask |= FS_IN_ISDIR;
 
         dnotify_parent(dentry, DN_MODIFY);
-        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 
+        fsnotify_parent(dentry, mask);
         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
 }
 
@@ -223,9 +240,9 @@ static inline void fsnotify_open(struct dentry *dentry)
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
-        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 
+        fsnotify_parent(dentry, mask);
         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
 }
 
@@ -236,16 +253,15 @@ static inline void fsnotify_close(struct file *file)
 {
         struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
-        const char *name = dentry->d_name.name;
         fmode_t mode = file->f_mode;
         __u32 mask = (mode & FMODE_WRITE) ? FS_CLOSE_WRITE : FS_CLOSE_NOWRITE;
 
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
-        inotify_dentry_parent_queue_event(dentry, mask, 0, name);
         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 
+        fsnotify_parent(dentry, mask);
         fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE);
 }
 
@@ -260,9 +276,9 @@ static inline void fsnotify_xattr(struct dentry *dentry)
         if (S_ISDIR(inode->i_mode))
                 mask |= FS_IN_ISDIR;
 
-        inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name);
         inotify_inode_queue_event(inode, mask, 0, NULL, NULL);
 
+        fsnotify_parent(dentry, mask);
         fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
 }
 
@@ -311,8 +327,8 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
                 if (S_ISDIR(inode->i_mode))
                         in_mask |= FS_IN_ISDIR;
                 inotify_inode_queue_event(inode, in_mask, 0, NULL, NULL);
-                inotify_dentry_parent_queue_event(dentry, in_mask, 0,
-                                                  dentry->d_name.name);
+
+                fsnotify_parent(dentry, in_mask);
                 fsnotify(inode, in_mask, inode, FSNOTIFY_EVENT_INODE);
         }
 }